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Basis of Presentation and Summary of Significant Accounting Policies - Warranty Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Balance at beginning of period $ 327 $ 410 $ 314 $ 81
Accruals for warranties issued 30 49 46 381
Adjustments to existing warranties (52) (56) (52) (56)
Settlements made during the period (in cash or in kind) (7) (12) (10) (15)
Accrued warranty reserve $ 298 $ 391 $ 298 $ 391